Switch-control mechanism



YJune`25, 1929. F. H. cUsHlNG 1,718,895

SWITCH CONTROL MECHANISM Filed Aug. 4, 1926 ATTORNEY Patented June 25,1929. "tf

UNITED STATES `IEISLAII'K H. CUSHING, 0F LOUISVILLE, KENTUCKY.

SWITCH-CONTROL MECHANISM.

Application filed August 4, 1926. Serial No. 127,106`

This invention relates to certain `novel and useful improvements inswitch control mechanism and more particularly to a control mechanismintended for use in connection with electrically driven tools andparticularly adapted for use in connection with portable electricallydriven reamers and drilling machines and the like.

One of the many objects of the invention is to simplify the generalconstruction of the mechanism controlling the circuit switch of theelectrically driven tool and to `avoid the use of complicatedanddelicate machinery,

A further object of the invention is to pro vide mechanism of thischaracter which can be expeditiously operated by the finger oftheoperator without releasing his hold upon the tool thereby greatlyfacilitating manual manipulation of the electrically driven tool.

A; further object of the invention is the pro vision of 'mechanism ofthis character which has but a single one way operating trigger foroptionallyopening or closing the circuit switch of an electricallyoperated tool.

Other objects will appear hereinafter.`

The `invention consists in the combination and arrangemcntof parts to behereinafter kdescribed and claimed.

The Vinvention will be best understoodby reference .to the accompanyingdrawing illustrating the preferred form of construction, andin which:

Fig. 1 is asideelevational view of anelectrically driven tool showingthe handle `portion thereof broken away to illustrate the applicationfofthe invention therewith.

Fig. `2 is a fragmentary side elevational view of the mechanism,embodied in the invention. `for controlling the circuit switch.

Fig is `an elevational view showing my improved mechanism operativelyconnected with a circuit switch of a well known type used in connectionwith electrically driven Fig. 4 is a perspective view of a carriageplate embodied "in the invention.

Fig. A5 is a fragmentary edge view of the invention taken substantiallyon line 5-`5 of Fig. 2. Y p

As herein indicated it is an object of this invention to provide controlmechanism of `this character whereby theoperator o-f the electricaldrill need not, to operate the control mechanism, release his grip fromthe handle ofthe electrical tool thereby enabling jheloperator toexpeditiously manipulate'the To accomplish this'and other objects of theinvention I have illustrated in the drawing an electrical tool Aincluding among other things a chuck B for holdingthe drill or-the likeand a handle `portion C vvh'ichis in most instances hollow inconstruction. Confined within this handle portion C is myimprovedcontrol mechanism D'which controls the circuit switch E which controlsthe electrical circuit to the motor (not shown) of the tool A.

` This circuit switch E yis of any approved construction which includesa circuit "breaker arm 10 pivotally supportedas at 11 by a supportingstructure 12 which isopera'blehy an operatinghandle 13. This handle 13includes a knob shaped end portion 14 and is pivotally connected 'to thestructure 12 as Vat y 15. The operating handle 13 is operativelyconnected to the breakeriarm 10 through the medium of a spring controlrodl whereby when the operating handle 13 is pivoted in a directionabout the v:pivot 15 the spring 17 of the rod 16 will act upon thebreaker arm 10 andpivot this breaker' arm 10'into contact with `theconductorfingers 18 of the circuit switch v y The circuit switch E isnot included as a part of my invention and I therefore have illustratedan approved circuit switch to demonstrate the application of myinvention as at this time it is pointed out that any type of circuitswitch may be employed which includes a pivotally mountedioperatinghandle as indicated at-13. i

Secured to the handle portioniC through the medium of screw members 19is a carriage plate 20 definingat one end portionl'spaced lateralprojectionsQQand at an opposite end portion an extension Q3 and asingle'lateral projection 24. Pivotally associated as at`25 with thecarriage platerQOis an oscillatory member orlever 26` connected at oneendas at 27 to a connectingrod 28 which rod is connected as at 9.9 tothe knob 14 `ofthe operating handle 13. This oscillatory member definesat its pivot end portion atwo-toothed ratchet head 30. i i

`The carriage plate 20 has struck therefrom a guideloop 31 and securedto this guide loop 31 as at 32 is a spr-ing member 33 having an end4portion connected as at Si to the oscillatory `member 26. This springmeniher "the operator releases hisfinger from the oprfunctions tocomplete final oscillatory movement ofthe member 26 in either directionVabout the pintle 25, it being pointed out that the connection 34 isofi'set relative to the pivot 40. This paWl 4,0 vis `movable beneath theguide loop31 ina direction along its length into engagement lwith eitherof the teeth 41 of the ratchet head 30. Movement in one dilrection ofthe pawlV 40 lis controlled by a spring member 42 having one end portionconnectedas at 43 tothe carriage plate and anV opposite endyportionconnected as atv 44 to the adjacent end'portion of the pawl 40.

.-Movement of the operating trigger in one direction is accomplishedthrough the medium ofthe pawl 40 when'moved in the same ydirectionby theaction of the spring 42 and this operating trigger is limitedinmovementl in saidV one direction bythe projection 24.

The oscillatory member 26 is likewise limited in its Yoscillatorymovement by means of thez lateralfprojections 22 as best shown in 730 yY Fig. 4.'

- The finger engaging portion 37 of the operating trlgger 36projectsthrough an elongated slot`45` formed in awall portion 46 of ,they handleportion C'. l

To operate thecontrol mechanism, the operaltor'having his hand in firmgrasping relation with the handle C presses one fingerAa'gainstthetinger portion'37 to pivot the-0pverating trigger about itspivot 35. This pivotal v4movementof the operating trigger 36 acts'. uponthe vpavvl 40 and moves this pawl in :a direction to engage the tooth ofthe teeth 41ofthe ratchet headvdisposed in the path of movement of thep'aWl. When the end portion 41' ofthe paivle40 is' brought intoengagement with this tooth the member 26 is urged to pivot'a'bout thepivot point 25 by continued movement of the pawl 40 and0perating'trigger .36.f Y Final movement of the member 26 is completedby action of the spring member 33. Pivotal movement of the lmember 26by'action ofthe paWl 40 acts upon the connectingrod V28 to move thisconnecting' rod in the direction of pivotal movement lof the oscillatorylever 26 land this connecting rodin turn 'acts upon thehandle 13 andpivots this handle 13 in the direction of pivotal movement of theoscillatory member or lever 26 closing or openingthe circuit as the casemaybe;v After this has been accomplished eratingtrigger^37 and thisoperating trigger is returned to its normal position as is like- ,Wisethe paWl 40 by actionof the spring 42.

By repeating this operation the paWl 40 will be moved into engagementwith the other of the teeth 41 now disposed in the path of movement ofthe pawl.

From the above description it is manifest that I provide a simplecombination and arrangement of parts for controlling the eircuit switchused in connection with electrically driven tools and that by the use ofsuch mechanism the operator is in position to manually operate thecontrol mechanism without releasing his grip from gripping relation withrespect to the handle portion C.

, lVhile I have illustrated and described the preferred form ofconstruction for carrying my invention into effect, this is capable ofvariations and modification wit-hout departing from the spirit of theinvention. I, therefore, do not Wish to be limited to the precisedetails of construction set forth, but desire to avail myself of suchvariations and modificai a tivo-toothed ratchet adapted for engage-Vment by the paWl for oscillating said member about its pivot connectionwith the carriage plate, and resilient means for completing finalpivotal movement of the member in either direction about its pivotalconnection With the carriage plate.

2. A mechanism of the class described including a carriage plate, anoperating trigger pivotally carried by the carriage plate, a pawlpivotally connected to an end ortion of the operating trigger andmovable along its length inone direction by operationof the trigger,means for moving the pawl in an opposite direction, a member pivotallycarried by the carriage plate and having at one end a" two-toothedratchet adapted for engagement by the pawl for oscillating said memberabout its pivot connection with the carriage plate, a spring memberinserted through an opening formed in said member and having oppositelend portions connected to the carriage plate, said spring member servingto complete filial pivotal movement of the member in either directionabout its pivotal connection with the carriage plate.

3. A mechanism of the class described including a carriage plate, anoperating trigger pivotally carried by the carriage plate, a paWlpivotally connected to an end portion of the operatingtrigger andmovable along yue lll

its length in one direction by operation of the trigger', means lormoving the pavvl in an opposite direction, a member pivotally carried bythe carriage plate and having at one end a two-toothed ratchet adaptedt'or engagement by the pawl for oscillating said memberI about its pivotconnection With the carriage plate, a spring member inserted through anopening formed in said member, and having opposite end portionsconnected to the carriage plate, said spring member serving to completelinal pivotal movement of the member in either direction about itspivotal connection with the carriage plate, means for guiding said pavvlduring its movement toward operative engagement With either of theteeth.

4. A mechanism of the class described including a carriage plate havingat one end portion spaced lateral projections and at the opposite endportion a single lateral projection, an operating trigger pivotallycarried by the carriage plate and limited in its pivotal movement in onedirection by the single lateral projection, an oscillatory memberpivotally carried by the carriage plate and limited in its pivotalmovement by the spaced lateral projections, said oscillatory memberhaving at one end a tivo-toothed ratchet head, a guide loop struck fromsaid carriage plate, a paWl pivotally connected to the triggerintermediate its end portions and movable in a direction along itslength beneath the guide loop to engage one end portion With either ofthe teeth of the ratchet head whereby to oscillate said oscillatorymember, resilient means t'or completing initial oscillatory movement ofthe oscillatory member in either direction about its pivotal connectionWith the carriage plate, and a spring having one end connected to thecarriage plate and an opposite end connected to the pawl for moving saidpawl in an opposite direction along its length.

5. A mechanism of the class described in cluding a carriage plate havingat one end portion spaced lateral projections and at the opposite endportion a single lateral projection, a bell crank shaped operatingtrigger pivotally carried by the carriage plate and limited in itspivotal movement in one direc tion by the single lateral projection, anoscillatory member pivotally carried by the carriage plate and limitedin its pivotal movement by the spacedlateral projections, saidoscillatory member having at one end a twotoothed ratchet head, a pawlpivotally connected to the trigger intermediate its end portions andmovable in a direction along its length to engage one end portion witheither otl the teeth of the ratchet head whereby to oscillate saidoscillatory member, and a spring having one end connected to thecarriage plate and the opposite end connected to the paWl for movingsaid pawl in an opposite direction along its length.

In testimony whereof I aflix my signature.

FRANK H. CUSHING.

